A series of unfortunate hero catch phrases

"When a girl feels that she's perfectly groomed and dressed, she can forget that part of her. That's charm. The more parts of yourself you can afford to forget, the more charm you have. Scott Fitzgerald, Bernice Bobs Her Hair

It's actually "I will not say: do not weep; for not all tears are AN evil" - the book nerd in me had to correct that (note the punctuation). Regardless, this is one of the most meaningful things that Gandalf says in the Trilogy, in my opinion.